The Survivors Want to Sleep

After the Great Cold, which Ivan and Eva survived with a group of people underground, they are going nowhere. Civilization has collapsed, a person cannot sleep alone and dies unless someone wakes them up. The loners exhaust themselves, fight against sleep, and turn into unconscious dangerous drifters. People cannot stay in one place for long and are forced to move as bands follow their trail, capturing slaves and rats with wild dogs. Ivan and Eva notice strange signs, and this begins to worry them. Where do the signs lead: to salvation or to a trap?